upgrading tests to Junit 5

[vincent-fuchs]

fixes #80

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b1bc2ad) 80.12% compared to head (27b35bd) 79.96%.

Files	Patch %	Lines
...ommons/plugin/rules/TestClassesNamingRuleTest.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #82      +/-   ##
============================================
- Coverage     80.12%   79.96%   -0.16%     
  Complexity      145      145              
============================================
  Files            33       33              
  Lines           654      654              
  Branches         64       65       +1     
============================================
- Hits            524      523       -1     
  Misses          104      104              
- Partials         26       27       +1     

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